Patent US2957837A successfully refreshed from Google Patents.
Patent US3977398A successfully refreshed from Google Patents.
US3977398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluted sub-trochanteric nail system
Assignee: Kirschner Medical Corp
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Filing: 1976-01-12
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Granted: 1976-08-31
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Expires: 1996-01-12
Abstract
Abstract A sub-trochanteric intramedullary rod for use in fracture fixation in the femur characterized in that it is fluted throughout its length and has a minor portion of a diameter greater than its major portion, thereby being of stepped configuration. The distal ends of the flutes in each of the major and minor portions have sharp points thereon adapted to cut into bone and means are provided beneath the points to receive bone particles and chips cut by the points.
Inventors
- 👤 Albert H. Burstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:32
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7283
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
A sub-trochanteric intramedullary rod for fracture fixation of long bones comprising an elongated generally cylindrical rod member having a major distal portion and a minor proximal portion, said proximal portion having a diameter greater than the distal portion, a plurality of longitudinal flutes spaced about the periphery of each of said portions, the flutes on said major portion terminating in sharp cutting points which extend beyond said portion.
Claim 2
Dependent Claim
68 words
A sub-trochanteric intramedullary rod for fracture fixation of long bones comprising an elongated generally cylindrical rod member having a major distal portion and a minor proximal portion, said proximal portion having a diameter greater than the distal portion, a plurality of longitudinal flutes spaced about the periphery of each of said portions, the flutes on said major portion terminating in sharp cutting points which extend beyond said portion.
Claim 3
Dependent Claim
26 words
A sub-trochanteric intramedullary rod as defined in claim 1 wherein the flutes on said minor portion terminate in sharp cutting points which extend beyond said portion.
Claim 4
Dependent Claim
29 words
A sub-trochanteric intramedullary rod as defined in claim 1 and further including guide tip means of lesser diameter than said major portion and extending from the distal end thereof.
Claim 5
Dependent Claim
24 words
A sub-trochanteric intramedullary rod as defined in claim 1 wherein said major portion is curved to follow the natural curvature of the long bone.
Claim 6
Dependent Claim
18 words
A sub-trochanteric intramedullary rod as defined in claim 4 wherein the radius of curvature is about 127 cm.
Claim 7
Dependent Claim
26 words
A sub-trochanteric intramedullary rod as defined in claim 1 wherein the difference between the diameters of said major and minor portions is at least 1.5 mm.
Claim 8
Dependent Claim
87 words
A sub-trochanteric intramedullary rod for fracture fixation of long bones comprising an elongated generally cylindrical rod member having a major distal portion and a minor proximal portion, said proximal portion having a diameter greater than said distal portion, a plurality of longitudinal flutes spaced about the periphery of each of said portions, said flutes terminating in sharp bone cutting projections which extend beyond the distal ends of said portions, and means adjacent said projections on said major portion for receiving and holding bone chips and the like.
Claim 9
Dependent Claim
87 words
A sub-trochanteric intramedullary rod for fracture fixation of long bones comprising an elongated generally cylindrical rod member having a major distal portion and a minor proximal portion, said proximal portion having a diameter greater than said distal portion, a plurality of longitudinal flutes spaced about the periphery of each of said portions, said flutes terminating in sharp bone cutting projections which extend beyond the distal ends of said portions, and means adjacent said projections on said major portion for receiving and holding bone chips and the like.
Claim 10
Dependent Claim
48 words
A sub-trochanteric intramedullary rod as defined in claim 7 wherein said rod member is of hollow construction throughout and wherein said means for receiving and holding bone chips comprises a plurality of apertures in the surface of said rod member extending into communication with the hollow interior thereof.
Claim 11
Dependent Claim
31 words
A sub-trochanteric intramedullary rod as defined in claim 8 and further including an annular recess adjacent said projections on said minor portion for receiving and holding bone chips and the like.
Claim 12
Dependent Claim
29 words
A sub-trochanteric intramedullary rod as defined in claim 7, and further including guide tip means of lesser diameter than said major portion and extending from the distal end thereof.
Claim 13
Dependent Claim
40 words
A sub-trochanteric intramedullary rod as defined in claim 8 and further including an end cap secured to the proximal end of said minor portion and of larger diameter than said minor portion to serve as a limit stop during insertion.
Claim 14
Dependent Claim
26 words
A sub-trochanteric intramedullary rod as defined in claim 11 wherein said cap is provided with an internally threaded portion adapted for connection to rod extraction means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |